Automatic releasing and reengaging drive.



W. F. H. BRAUN.

AUTOMATIC RELEASING AND REENGAGING DRIVE.

APPLICATION FILED DEC. 5, 1912' 1,1 1 1,990. 7 Patented Sept.29,1914.

FILE 2.

WITNESSES 2 INVENTOR A TTORNEY rns PATENT oiuuon.

WILLIAM: F. H. BRAUN, 0F PHILADEL'PHIA, PENNSYLVANIA, ASSIG-NOR TO COLES MANUFACTURING COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPORA- TION OF PENNSYLVANIA.

AUTOMATIC RELEAsINe AN IJ REENGAGING DRIVE.

\ Application filed December 5,1912. Serial No. 735,058.

To all whom it mag/concern:

Be it known that I, TVILLIAM EH. BRAUN, a? citizen of the United States, residing in the city of Philadelphia, county of Philadelphia, and State of Pennsylvania, have invented certain new and useful Improvements in Automatic Releasing and Reengaging Drives, of which the following a specification.

invention has for its object the provision of means for automatically releasing a driving member, such as a grinding member of a coifee'or other mill, from its driv-- ingmember, when such driven member offers toogreat a resistance, as in the case where too large an object or an object incapable of being'ground lodges between the grinders; and for automatically reengaging the driven member with the driving member.

My invention resides in the features hereinafter described and claimed.

For an illustration of one of the forms my invention may take'reference is to be had to the accompanying drawing, in which:

Figure 1 is a longitudinal sectional view, parts in elevation, through mechanismemhodying my invention. Fig. 2 is an end elevational View of the same. Fig. 3 is a side elevational view of the driving member.

A shaft 1 carries a key 2 over which may be passed from left to right the cylindrical hub or extension 3 having the longitudinal groove 4 large enough to pass freely over the key 2. A rotary'grinding member 9 having the teeth 5 has a hub 6 which is mounted upon the hub 3. Babbitt or other metal 7 intervening between the hubs 3. and 6. The grinding member 9 is positively driven by driven member 8 through the Babbitt metal 7 The driven member 8 is provided with one or more lugs 10 having extending therethrough in a substantially radial direction a hole 11. Into the hole 11 is threaded a bolt or screw 12 and beneath the bolt or screw 12 is disposed a spring 13 compressed against a ball or round nosed plunger 14 which in the case shown is of a diameter too large to pass through the lower constricted opening 15 at the inner end of the hole 11. The member 8 is countersunk to receive the driving member 16 held to the Specification of Letters fatent.

Patented Sept. 29, 1914.

shaft. 1 by the key 2 and having depressions 17 receiving balls or plungers 14 and extending a relatively short distance circu1nferentially of member 16. A look nut 18 is prefcrably provided for each nut or screw 12.

The stationary grinding member, or mem ber cooperating with the driven cutting member 9 is shown at 19, the same having a hollow hub 20 receiving the hub 6.

The operation is as follows: The shaft 1 is driven. by any suitable means such as a belt ormotor and carries around with it positively the driving member 16. The en gagement of the driving member 16 with the balls or members 14 transmits the rotary the member 16 will continue rotation without driving member 8, the members 14 in such case simply riding upon the outer cylindrical surface of the member 16. But the members 14 will immediately reengage in depressions 17 when such depressions are again brought around in front of the memhers 14. And if the resistance is no longer too great the memberS will again be driven by the member 16. 'Normally the springs 13 are set under considerable compression so as to cause the member 8 to be driven by balls 14 against a considerable normal resistance. Furthermore, if it is desired to separate the member 8 from the member 16 the screws or bolts 12 may be loosened, thereby releasing compression of springs 13 and allowing the members to easily recede to move the member 16 toward the left and out of the countersink in the member 8. Or such separation of members 16 and 8 may be accomplished without loosening the screws 12 provided sufficient pressure lon- ,gitudinally of the shaft 1 be exerted in which case the members 14 will yield in opposition to springs 13 as in the case of yielding during rotary movement. I

It will be noted that it is possible, by theconstruction described, to obtain the r members 14 be carried by the member 16.

. bers 9, Sand 16 may be stationary and the member 19 be the rotary member.

It is to be understood also that the depression'slx' may be in the member 8 and the What I claim is: i 1. Th' COII1bl112Ltl0n with a driving member having a cylindrical periphery andhav- 20 ing a circumferentially short depression in said periphery, of a driven member having a bore, said bore having an aperture of less diameter next to the periphery of said driving member, and a resiliently pressed ball too large to pass through said aperture projecting through said aperture normally engaging in said depression.

2. The combination of a shaft, a rotary member keyed thereon, a second member rotatable upon said shaft and upon the firstmentioned member, said first-mentioned member having sockets formed therein, said second-mentioned member having elongated openings formed therein and restricted at their lower ends, balls movable in said ppenings, said balls being of a less diameter than the diameter of the openings, and being of a larger diameter than the diameters of the restricted ends of said openings, whereby they will be limited in their movement toward the sockets in the first-mentioned rotatable member, adjustable plugs for the openings in the see end-mentioned rotatable member, and springs disposed within said openings and contacting with the adjustable plugs and balls.

In testimony whereof I have hereunto affixed my signature in the presence of the two subscribin witnesses.

WlLLIAM r. n. BRAUN.

Witnesses:

ELEANOR T. MGCALL, NELLIE Evans. 

